document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=776905>Question 776905</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Let the daughter's age be x<BR>\n" );
document.write( "Let the father's age be 4x<BR>\n" );
document.write( "3 years ago: Daughter's age = x-3<BR>\n" );
document.write( "Father's age = 4x-3<BR>\n" );
document.write( "Product of their ages:( x-3)(4x-3)=430<BR>\n" );
document.write( "Opening the bracket and applying quadratic formula method,  we shall have the roots as x= 12.3 and -8.6 <BR>\n" );
document.write( "So, taking the positive value of x= 12.3years.<BR>\n" );
document.write( "Present ages:<BR>\n" );
document.write( "Daughter's (x-3)years = 12.3-3 =9.30years (9 years 3 months)<BR>\n" );
document.write( "Father's age: (4x-3)years= 4×12.3-3 = 46.21years (46 years 2 months 1day)\r<BR>\n" );
document.write( "\n" );
document.write( "Checking:<BR>\n" );
document.write( "9.30×46.21= 429.753 = 430 (approximated) </SPAN>\n" );
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document.write( "Let the father's age be 4x<BR>\n" );
document.write( "3 years ago: Daughter's age = x-3<BR>\n" );
document.write( "Father's age = 4x-3<BR>\n" );
document.write( "Product of their ages:( x-3)(4x-3)=430<BR>\n" );
document.write( "Opening the bracket and applying quadratic formula method,  we shall have the roots as x= 12.3 and -8.6 <BR>\n" );
document.write( "So, taking the positive value of x= 12.3years.<BR>\n" );
document.write( "Present ages:<BR>\n" );
document.write( "Daughter's (x-3)years = 12.3-3 =9.30years (9 years 3 months)<BR>\n" );
document.write( "Father's age: (4x-3)years= 4×12.3-3 = 46.21years (46 years 2 months 1 week)\r<BR>\n" );
document.write( "\n" );
document.write( "Checking:<BR>\n" );
document.write( "9.30×46.21= 429.753 = 430 (approximated </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );